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suppositive

adjective
sup·​pos·​i·​tive | \səˈpäzətiv\

Definition of suppositive 

: characterized by, involving, or implying supposition : supposed

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History and Etymology for suppositive

Late Latin suppositivus, from Latin suppositus (past participle of supponere to place under—influenced in meaning by Greek hypothetikos hypothetical) + -ivus -ive

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